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(No Model.)

H. R. QUINBY. ELECTRIC ARC LAMP.

M t n e v n I Patented Nov. 80,1897.

Witnesses.

Attorney;

NiTnn STATES Parent @rrrcn.

HENRY R. QUINBY, OF ROCHESTER, NEW YORK.

ELECTFHG ARG LAW P.

SPECIFICATION forming part of Letters Patent No. 594,426, dated November30, 1897.

Application filed February 18, 1897. Serial No. GZ LOZQ, (N model.)

To (Mi-whom, it may concern:

Be it known that I, HENRY R. QUINBY, of Rochester, in the county ofMonroe and State of New York, have invented certain new and usefulImprovements in Electric-Arc Lamps; and I do hereby declare thefollowing to boa full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, and to the reference-numcrals marked thereon.

ln'ypresent invention relates to electric-arc lamps, and has for itsobject to improve the construction and operation of the devices forcontrolling the feed of the upper carbon; and it consists in certainimprovements hereinafter fully described and the novel features pointedout in the claims at the end of this specification.

In the drawings, Figure 1 is a vertical sectional view of a lampconstructed in accordance with my invention; Fig. 2, a detail sectionalView of the carbon-clamp and feeding device; Fig. 3, a cross-sectionalview of the same on the line a: 00 of Fig. 2; Fig. 4, a sectional viewon the line y 1 of Fig. 2.

Similar reference-numerals indicate simi lar parts.

The frame and operating portion of the lamp, with the exception of theclutch devices, may be of any suitable construction; but in the presentembodiment lhave adapted my invention to a form of lamp in which themagnet-body (indicated by 1) has the upper and lower annular portionsconnected by two or more vertical portions, being substantiallycylindrical, with more or less open walls.

2 indicates a core-piece attached to the end of the magnet connected toa tube 3, operating to suspend the lamp, and within the tube 8 is aninterior tube 4, forming a guide for the carbon-holder.

indicates the carbon-holder, sliding within the tube a and connected atits upper end to the upper end of said tube 4 by a conductor 6,preferably in the form of a light wire wound into a 'coil and serving toplace the carbon-holder in electrical connection with the portion of theframe carrying the positive current. The upper end of the holder 5 isprovided with a groove 7, cooperating with a rib or spline 8, secured tothe tube 4t and preventing the turning of the holder in said tube as itmoves vertically, thereby preventing unwinding of the conducting-coil 6or its displacement or disarrangement when the carbon is attached to theholder. The lower end of the holder 5 is provided with suitable springclamping-jaws 9, into which the upper carbon 10 is inserted and held byfriction.

11 indicates the solenoid or coil in connection with the magnet andwound about the interior brass lining or tube 12, and 13 the armatureencircling and slidin upon the tube l, having its upper end recessed toreceive the pole-piece 2, said armature being freely movable downward bygravity and upwardly by the current in the solenoid.

The carbon-clamp carried by the armature embodies a movable collar 14,encircling the carbon or the carbon-holder, preferably taperingexteriorly and movable within the chamber 15, formed in the lower end ofthe armature, the outer walls of said chamber tapering downwardly towardthe center and the collar being provided with three or moreradially-extending apertures or recesses in which are locatedbearing-balls 16, the construction being such that when the collar is atthe lower portion of the tapered recesses in the armature and the latteris raised slightly the balls engaging the carbon or carbon-holder andsaid tapering walls will hold the carbon and permit it to be raised withthe armature to form the arc, and when the armature is lowered by theburning away of the carbon until the lower end of the collar 14 engagesthe lower portion 1. of the frame said collar will be moved upward andthe carbon, being re leased from the clamp, will fall until againgrasped and held by the balls as the armature moves upward by theincreased strength of the magnet. When the current is reestablished bythe contacting of the carbon, the armature will be raised and the ballsin the clamp operated upon by the inclined walls and held against thecarbon-holder or carbon, raising the latter to reestablish the arc.

The collar is heavy enough to compel the positive movement of the ballsin the nar rower portion of the armature, so as to insure the positiveclamping and releasing, and in the present embodiment the lower end ofthe armature in which the tapering chamber is formed is made separatefrom the upper portion, the two being connected by screwthreads, asshown in Fig. 2. Attached to the lower end of the armature is plate 25,which limits the upward movement of the armature in the solenoid byengaging the tubular lining 12 of the magnet. in order to prevent theballs from falling out of the clamping collar when the carbon orcarbon-holder is removed, the inner ends of the apertures in which theballs operate are slightly reduced in diameter, as shown in Fig. Thisform of carbon-clamp is positive in its operation and insures the propergrasp on the carbon, providing for the feeding of the latter, and theballs being free to turn when released very little friction is offered,so that the carbon maybe fed in just a sufficient amount to secure thebest results. Furthermore, by eniploying the balls, as shown, betweenthe rmature and carbon, the latter beingpre v iited from rotation andthe armature tree to turn, there is no liability of the parts stickingor becoming inoperative by reason of any relative movement. The collarcarryingthe balls free to turn independently of the armature.

The employment of the conductor 0 at the upper end of the carbon-holderprovides for the direct connection with the latter in the circuit,thereby preventing the spar-kin g and burning which is liable to takeplace it wiping contacts are employed. While the springs at the end ofthe carbon-holder for grasping the carbon may be formed directlythereon, I prefer to employ a removable tip for the carbon-holding. rod,on which the graspingsprings are located, as shown more particularly inl. The other portions of the frame of the lamp and the devices forholding the lower carbon may be of any suitable construction, and l haveshown the lower frame connected by tubular rods 21 with the lowerportion of the magnet-frame, the conductor leading to the lower carbonpassing through one of said rods, and l have also shown a lamp of thetype employing a small globe 22, in which the arc is formed; but it willbe understood thata largerinclosing outside globe is also employed,attached to the frame in any suitable manner.

I claim as my invention 1. In an eleetric-arc lamp, the combination withthe movable armature having the tapering recess, of the carbon-clampembodying the collar through which the carbon passes, movable in saidrecess, having the radial apertures, and the balls arranged in saidapertures and engaging the walls of the tapering recess and also thecarbon, and a releasing projection cooperating with the clamp-collar,substantially as described.

2. lnan arc-lamp, the combination with the movable armature, having thetapering recess, of the collar through which the carbon passesvertically movable in said recess and having the radial apertures, theballs in the apertures engaging the sides of the tapering recess and thecarbon, a movable carbonhelder, and guides for preventing its rotation,and an extensible eurrent-conductorattached to the carbon-holder,substantially as described.

S. in an arc-lamp, the combination with the tubular arm ature having theremovable lower end provided with a tapering recess, of the collaroperating in said recess, having the radial apertures, and balls in theapertures cooperating with the walls of said recess to clamp the carbonpassing through the armature, substantially as described.

HENRY it. QUlNllY. Witnesses:

1 l Cnunen',

A. Rona.

